There is no evidence, or speculations (that I'm aware of), that the Aborigines of Australia and the Native American's are related any closer than they share the term "humans."
Native Americans in the United States not the other answers
Approximately 2 of Americans have Native American ancestry.
There are no longer any Australian indigenous people (Aborigines) living a traditional native lifestyle in Australian rainforests.
Australian Aborigines are not a civilization, they are a people native to the Australian mainland including the island of Tasmania. It is widely believed that the first Aborigines migrated to Australia over 40,000 years ago.
Mestizo.
The word in English applied to native tribes is "aborigines". It is usually capitalized Aborigines when applied to the indigenous Australian peoples.
60% of African Americans have some European Ancestry, while 75% have European or Native American ancestry. That leaves 40% with no European Ancestry, 85% with no Native American ancestry and 25% with only African ancestry.
Native Americans in the United States has a very similar past and status as the Aborigines
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In 1787, approximately 90-95% of the non-Native American inhabitants of the thirteen states were of European ancestry. Native Americans, African Americans, and individuals of mixed ancestry made up the remaining 5-10%.